Yea, if they want it bad enough they will find a way to steal it, my uncles RX7 got stolen 3 weeks after it was painted, and he had it in his locked garage with a locked gate around the driveway, and 3 dogs, they cut all the locks, waited till the dogs went inside, and then rolled the car out of the garage and driveway, and down the street and then onto a trailer. He got it back, but the paint was all messed up....

Your best bet is THE CLUB, and your friend the steering lock. Alarms, and flashing lights help deter lazy people. I have a blue flashing light in my corner lights, and on my dash. I also have a proxy sensor in my car, so if anything in there moves, it goes off.

And my stereo still got jacked, they punched a screwdriver/drill/icepick through my fender and into my battery and drained it till everything was dead. Now I have a small battery under my hood, for my alarm, and my battery is in my trunk in a box. I have had no problems since, and thats with a DVD in the dash, parked in Down Town Tacoma parking garage for 3 days.